Interesting note on the 7028273 and 7028270 carbs. They first appeared on the 68 RA I (late) and RA II engines. They are also listed for the 69 RAIII engines according to the GTO Association Illustrated Indentification Guide (Eric Whites book). The 69 RAIV engine was 7029270 and 7029273. Normally the 4th digit is the last digit of the year in this era. Is the book wrong?
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